[Rover]

There's no point in creating a slow prime (unless it's designed specially for compactness like the Voigtlanders). And this new Nikkor looks like it's a good deal better than either the Sigma 20/1.8 or the Voigtlander that is 2 stops slower and not a great performer away from center until stopped well down. Oh, and it's MF. If I had been shooting Nikon I would've considered this 20/1.8 unit. Stop down to f/5.6 and you're golden (and the Voigtlander never reaches that level, even at f/11).